1、51單片機定時器秒表設計程序#include<reg51.h>typedef unsigned char UINT8;typedef unsigned int UINT16;code UINT8 SEGMENT10=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90;code UINT8 SHU10 =0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10;code UINT8 SELECT8 =0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe;#define

2、S1 0x0e#define S2 0x0d#define S3 0x0b#define S4 0x07sbit SPEAK=P35;sbit P3_3=P33;UINT8 mSecond,Second;void Delay(UINT16 t) UINT16 i,j; for(i=0;i<t;i+) for(j=0;j<114;j+); UINT8 Scankey(void)UINT8 key;if(P3&0x0f)=0x0f)return(0xff);Delay(10); if(P3&0x0f)=0x0f)return(0xff);key=P3&0x0f;

3、while(P3&0x0f)!=0x0f);return(key); void Display(void)static UINT8 num=0;P2=0xff;switch(num)case 0:P0=0xff;break;case 1:P0=0xff;break;case 2:P0=0xff;break;case 3:P0=0xff;break;case 4:P0=0xff;break;case 5:P0=SHUSecond%100;break;case 6:P0=SEGMENTmSecond%100/10;break;case 7:P0=SEGMENTmSecond%10;brea

4、k;P2=SELECTnum;num+;num%=8;/if(num=8) num=0;/*定時器初始化程序void timer_10ms(void)/定時器T0定時10ms TMOD=0x01;TH0=-10000/256;TL0=-10000%256;TR0=1;/啟動T0*/main()static UINT8 a=0; UINT8 i,j;UINT16 z; mSecond = 0; Second = 0; TMOD=0x01;TH0=0xdc;TL0=0x32;TR0=1;/啟動T0EA=0; ET0=1; while(1) Display(); Delay(2); i = Scan

5、key(); if(i=S1)/啟動 EA=1; else if(i = S2)/停止 EA=0; else if(i = S3)/清除 EA=0; Second=0; mSecond=0; if(i = S4)/暫停 EA=0;if(a=0)a=1;else if(a=1)a=0;EA=1;if(Second=10)while(1) for(j=0;j<100;j+) SPEAK=0; Delay(1);SPEAK=1; Delay(1); for(z=0;z<100;z+)P2=0xfb;P0=SHU9;Delay(5);P2=0xfd;P0=SEGMENT9;Delay(5);P2=0xfe;P0=SEGMENT9;Delay(5);P2=0XFF; for(j=0;j<100;j+) SPEAK=1; Delay(1); SPEAK=1; Delay(1); /Delay(1000); /void int_0() interrupt